openssl_cipher_key_length Gets the cipher key length &reftitle.description; intfalseopenssl_cipher_key_length stringcipher_algo Gets the cipher key length. &reftitle.parameters; cipher_algo The cipher method, see openssl_get_cipher_methods for a list of potential values. &reftitle.returnvalues; Returns the cipher length on success, &return.falseforfailure;. &reftitle.errors; Emits an E_WARNING level error when the cipher algorithm is unknown. &reftitle.examples; ]]> &example.outputs.similar;